scholarly journals The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section

2009 ◽  
Author(s):  
Dieter Schildknecht ◽  
Roberto Fiore ◽  
Igor Ivanov ◽  
Alessandro Papa ◽  
Jacques Soffer
Keyword(s):  
Cross Section ◽  
Photoabsorption Cross Section ◽  
Color Dipole ◽  
Dipole Picture

scholarly journals Color dipole picture of deep inelastic scattering, revisited

2016 ◽  
Vol 31 (30) ◽  
pp. 1650157 ◽  
Author(s):  
Masaaki Kuroda ◽  
Dieter Schildknecht
Keyword(s):  
Experimental Data ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Photoabsorption Cross Section ◽  
Reduced Cross Section ◽  
Color Dipole ◽  
Analytic Expressions ◽  
Dipole Picture

Based upon the color-dipole picture, we provide closed analytic expressions for the longitudinal and the transverse photoabsorption cross-sections at low values of the Bjorken variable of [Formula: see text]. We compare with the experimental data for the longitudinal-to-transverse ratio of the (virtual) photoabsorption cross-section and with our previous fit to the experimental data for the total photoabsorption cross-section. Scaling in terms of the low-[Formula: see text] scaling variable [Formula: see text] is analyzed in terms of the reduced cross-section of deep inelastic scattering.

scholarly journals SCALING IN γ*p TOTAL CROSS-SECTIONS, SATURATION AND THE GLUON DENSITY

2001 ◽  
Vol 16 (28) ◽  
pp. 1829-1839 ◽  
Author(s):  
DIETER SCHILDKNECHT ◽  
BERND SURROW ◽  
MIKHAIL TENTYUKOV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Gluon Density ◽  
Hera Data ◽  
Leading Order ◽  
Total Cross Sections ◽  
Vector Dominance ◽  
Color Dipole ◽  
Dipole Picture ◽  
Increasing Function

Including the new HERA data, the γ*p total cross-section is analyzed in the generalized vector dominance/color-dipole picture (GVD/CDP) that contains scaling in [Formula: see text], where Λ2(W2) is an increasing function of W2. At any Q2, for W2→∞, the cross-sections for virtual and real photons become identical, σγ*p (W2,Q2)/σγp (W2)→ 1. The gluon density deduced from the color-dipole cross-section fulfills the leading order DGLAP relationship. Evolution à la DGLAP breaks down for η≲0.1.

scholarly journals The color dipole picture for prompt photon production in pp and pPb collisions at the CERN-LHC

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
G. Sampaio dos Santos ◽  
G. Gil da Silveira ◽  
M. V. T. Machado
Keyword(s):  
Cross Section ◽  
Free Parameter ◽  
Good Description ◽  
Photon Production ◽  
Prompt Photon ◽  
Color Dipole ◽  
Gluon Saturation ◽  
Free Parameters ◽  
Parameter Approach ◽  
Dipole Picture

AbstractA study on the prompt photon production within the QCD color dipole picture with emphasis in pp and pA collisions at the LHC energy regimes is performed. We present predictions for the differential cross section as a function of photon transverse momentum at different rapidity bins considering updated phenomenological color dipole models, which take into account the QCD gluon saturation physics. The results are directly compared to the recent experimental measurements provided by CMS and ATLAS Collaborations, showing a reasonable agreement in all rapidity bins with no free parameters. Special attention is given to the IPSAT model given its good description of the data in all rapidity bins from low- to high-$$p_{T}$$ p T ranges. As a result, a free-parameter approach has succeeded in describing the LHC data for prompt photon production, while new predictions for the 13-TeV data is presented in view of new data to confirm such prospect.

The absolute N2 K-photoabsorption cross section up to hω = 450 eV

1978 ◽  
Vol 58 (2) ◽  
pp. 263-266 ◽  
Author(s):  
H. Petersen ◽  
A. Bianconi ◽  
F.C. Brown ◽  
R.Z. Bachrach
Keyword(s):  
Cross Section ◽  
Photoabsorption Cross Section ◽  
The Absolute

scholarly journals total cross section in the dipole picture of BFKL dynamics

1999 ◽  
Vol 555 (3) ◽  
pp. 540-564 ◽  
Author(s):  
Maarten Boonekamp ◽  
Albert De Roeck ◽  
Christophe Royon ◽  
Samuel Wallon
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Dipole Picture
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